Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
QuickBooks Time - Easily track time for effortless payroll, invoicing, and job costing—without the paperwork, guesswork, or hard work.
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.
Replicon - Replicon is a unified time-tracking software that elevates time as a strategic asset within an organization, to improve operational productivity, performance, profitability, and compliance.